SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535c36927245bdaa28b7e42926793e23506857a491e748cc0107edf502dfa636' 
  AND token = 'rWnCKRshzB8xMvz8ZYkCOycaxW+s63hVDfwVQ5KjuNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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