Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd893c6cd62f604e722012dcf9b6f210ef9bde5f5b26d13fcb27842070e8d2859' 
  AND token = 'x9zJefB9ZKMj8uTRIxm+kkjsdW92gkiWCdkGKDGMhvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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