SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725c3abdb93a6f2eebd742c919d85eacce55a5bda18103607565ebb652f4f533' 
  AND token = 'hpLjB8f9ev8smA4+GJXHiok5KqXvOMb1CkAqkWXnw7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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