SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26815551da210470d52b2d9aa383ec8b29153f1e4ca2d87b2bb242d2566bfb4f' 
  AND token = 'ZKl+CMHEZZrMGpYDxTw0/uVRjZ80EXNh98kvNVH/+UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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