SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f18707fb074bee695bb3bbfdc14a8f10515e67a46392d003a46e52745d3377' 
  AND token = 'BcVJ/CF59vakIO6L8I2dUR0KKDUY9/zWJPdzl89DiqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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