SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd330e149ec46863346c52e4f20f57b8c7bea2fcb9589b246b121a8de91f07089' 
  AND token = 'zaS2/Bgn+DLMx/WWM/RbTcSGkh1kIaZXwUJ059ZlONM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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