SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fe259a4d2dab8a9f29aa61a6739dd652b6fc13f63808640427aab111341fb1' 
  AND token = '9ZPz4Z7NunIiWzNhuKSUjgHnaD/5TG+WlITcabOCFrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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