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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb4e263f8117dd0c528ec4747d2e585b6e84e9d60c03adb9fbb5a7799436d0f' 
  AND token = 'Z4gsv5oi4l4N9iqvzq5zLVPS7yvSTZoy4q8SWNok7yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}