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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672d45d729e5dc6143df61e40d02377f4e3121e43845879f186ff512e57dd6fa' 
  AND token = 'jLKCfpyLOgZJcQIHMDzKmAN7pvOH6kLyBNaa1/vCHTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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