SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6013f3b134634b7558ad5b4ecebf82fa954fb7a7fd08b2ba2ae10818cc3f1c0c' 
  AND token = 'YC9vCD6KvyGi7BNpEmHhXVJi19owXH8pfNCRxz9dG/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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