SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb358762f27a2c5c1d13c20dbc161990fd06eb1edf8e93b546c17a8a6db45506' 
  AND token = 'YY8KZc4nbhXhA8g3pHzkPdRKQHsE9tICPnQVBZxSuCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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