SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25862309922a0f05f00174960ad7fbfd7bb02bcac7e4b7205c7fda9238e90b7c' 
  AND token = 'TTqFB9WF/Zn+zYVDOFQNmyRNZuRrbqKjOG3CnmNaL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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