SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a87588ca7849298b35c23efd85a113205e74d386b5387c742b3fa6b25eea3f' 
  AND token = '0cUArUWFpYzzJVgPHHn+xI/36bOjmIo2KKWXdJn9TJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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