SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22bf3665f170cc6fe7e4a10be78b4cf8a51bc7723064ff9f8315932b32ddbe35' 
  AND token = '+OUsUI/7DL+67jbJ28qz9lqizCPVlvm+/rmBF9O02yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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