SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d09ef321cd837a75a7b12748a8d0b92d201469a75f96305e811ac5f3dbe9f4' 
  AND token = 'ZQTwjfWMD4SKQzru8xMGIDZfgmKxXwihUKP6lCD0cmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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