SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f333666221d161acb335869f53d0452eda91bf0619f314cd50e0b2c2601fa14' 
  AND token = 'quU0OYIjElwVobxpGV+u+kCMXhGtWOo1MF3qBm7lXZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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