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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f9ce3fe061cd4b5ab0a3bef0dc44bb096e5cc84769be3aeef548fdcea06246' 
  AND token = 'aurO/nrKTLcQAQ9nqYtFH+WcrFik+AZxJQ0AMOBYjwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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