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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59e94683fbc5e78ff0820a07d5a34f8e3dc90385b2245e781ed441eed6918d6' 
  AND token = 'rb++WhzMq5ZR8599gdNmyJ+wIlp6i9PUB3J4TO2xVCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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