I made a version that's a bit faster and also restores focus to the frontmost app when called. You may need to add in some delays.
https://github.com/delikat/alfred-workflows/raw/master/1Password Copy.alfredworkflow
tell application "System Events"
set frontmostApplicationName to name of 1st process whose frontmost is true
open location "onepassword://extension/search/{query}"
set frontmost of process "1Password 7" to true
key code 48
key code 124
key code 125
key code 36
set frontmost of process frontmostApplicationName to true
end tell
