SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682c43426cdfe84220594d4ac6fea0c318c0410e1b338d93cc3f087ed788f939' 
  AND token = 'wZh7+9jUC0JKSgviM3JsNQUst02VFlY6KamKYOcYGto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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