SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6edccf1133e37159983c52a14ffcda27036e3b64be91d2158701fb03238f6a' 
  AND token = '/WKBDyC5JvIzHBh8imDOw6cVJkwtHd/b+sQjhf/yTJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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