SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de70e1cb1da8f7837b4c1364e1db0f6d302f52641554ea0787a7c7a210b6c2ba' 
  AND token = 'mRHL68YFraEN/0XnIhvgKcZx1p3O6ayIKBlozJDvGgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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