Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e338c658d13eb38d8d39404d22cad884a4a7d852b14373f950b18eb5ac087621' 
  AND token = 'jy0PScuh2juElysgaua7nuB+2MwopbAIhpKuCul6a4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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