Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b085d1cdf614f9ba3d5663419a3550d293481ad0cbf3dbdbece92d91b1fa194' 
  AND token = 'YoMIv/ROuwMQWGjwv0krYdatJ/OYE+zKUxyUPWNOzOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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