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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7a7632b34ab247b46a9f3321eefd795c5f78040bbe70bffe19ae714951a4d9' 
  AND token = 'KcLOozj4IYLk0RvlQRqUNCcDmalxQx95tgBpy8Ifh+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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