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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bba2a28a25882d16796808165e9dbf1fb5a5198e35cee3c33ddd4a2d01b353' 
  AND token = 'Ol2MQn/m40PHqqCS7xwWBwOdaAo2QNDNn6qxYGtLk9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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