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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63d95caebfc1e4a970c5d0de786bd638a315b7a6fd5e6293880afa225af8f42' 
  AND token = 'k6Vm+mcSNubmTKUceTZVDZ3uOi0Se+QKpLX+FyGYEZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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