This no longer works for some reason with 1Password 4. I think they may have stopped using x-callback-url? I'm not sure.
Anyway, instead you can use this AppleScript as an Alfred action. This presumes you have 1Password 4 open. @nickcjr you may want to update your workflow with this.
on alfred_script(q)
tell application "System Events"
keystroke "l" using {control down, command down, option down}
end tell
end alfred_script