SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd7c6092fb4933a246db4a3559ee2559a26d1fb52297f7ddf5fb4410893b4ae' 
  AND token = 'Y1gUayzSqt+V2xgTw2W8QZH2CXVFGo51pDVxYu2dJtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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