SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09399c89292e90394e8f60fc490e2b321694186174fb586788a909fd0abf6b52' 
  AND token = '11Z7zNnN0V8UKzV8hUYrwwB/uU1XFvwKifKyJZP8FZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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