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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bdb6d0ee45503970cd628a6a15ab8a4b8702ec085a9679132bcc945db444c7' 
  AND token = 'iVm5QitfqrPXm6M4uMlRTFkemymntyZPL4uNR1GhDzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables