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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9266c22230ea52c37a9524f86bfa04a175f1f5b7be8acf60f592c9d11f88b61' 
  AND token = 'QwKXtbYwKwMHXbd9GuECYm4k6KVVTgQEwD3cFDg4API=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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