SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '220d3117758203961cf2dc04d59ca00a19356a9b80ec06d6dbd391ad876d546a' 
  AND token = '+hWs+7XOqs4MK8xB+XDJTT1MeDGBwU9jK5VXzkG0flM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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