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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd419d923ba080ddb1273c0892fc5bd8f6455a71786ac238be84bf80c9dcc22e3' 
  AND token = 'DxhESJEjper041b+z6DUcepS0Ri6emL976hk8La42ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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