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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65feb49b224c9c62fe4d5178fd6762dcaef75c30be7714b4cfd3ceb9a347027' 
  AND token = 'qJbGKVnK9tzfDl9q19SK+0RssXXK06Yn5jaO8JRQFRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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