SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd6043d029d85cc9e44d71f5f478c0e48f9367484318330dc03ed8eea9aa678' 
  AND token = 'pYFtLYatq/wxwDGXt5/CMg1nfH8Aemkj7VqDvP/goKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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