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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add30e90f9306f696d35b8e33180fb2568d62aee4fcc91bc415d6eb56ca5d28d' 
  AND token = 'Oa6VLKxZVZVy/IZbmjCeYL3K1St4IFUbQbjGtteNlkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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