Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3d1cbaa564f479cd9ca33673221ef10a4fc1fa9ea0d5372b895cefbdbd094e' 
  AND token = 'EH2W+ZkArF0EA1el/2fdYpDzIhCxtRLA+jfk2UmsjiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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