Why am I asked for my Keychain password when the keychain is already unlocked?
This behavior started suddenly after migrating to a new machine.
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This happened to me after changing my login password. I fixed it thanks to article on Apple support: https://discussions.apple.com/thread/6724601
Simply I had to change password for my "login" keychain.
But I was asked to input password to open "Local items" keychain. I solved that issue exactly according this post: http://support.apple.com/en-us/HT203897 You need to open folder ~/Library/Keychains/, find and delete folder with name similar to "A8F5E7B8-CEC1-4479-A7DF-F23CB076C8B8" and restart your Mac immediately.
I had to fixed both "login" and "Local items" prompt to solve it. Only changing password for "login" keychain seemed not to work although it should according Apple support. But I haven't test it heavily.
Hope it helps.
The problem is often caused by the migration to a new mac I do not know exactly why but I know how to fix it. you have to reset your login keychain :
In Keychain Access, choose Preferences from the Keychain Access menu
click the Reset My Default Keychain button. This will remove the login keychain and create a new one with the password provided.