SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c8e7a19e6226727c4a58c79b90adfb4f68066c795363a37a5b5ed7b50f3c20' 
  AND token = 'vtYg9NmHbqCb6uATEJ5YWAVlnysjvM+/9iZcLshAEzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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