SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9707ca1716855912597be64e47c10dc4a7f22f0aac881c9cfd292a96ce3486b9' 
  AND token = 'kDv/wJfDI53LxqQj5/hGzgqxHlGHNkvOKvUX8eqavHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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