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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d481288e96005e9d13c7b7b72e4e4e9bb02f8f5d6ec3b17d4a2ae8db1e329a' 
  AND token = 'U+K7/5yd+VFwBc7l9+hASCN1bprESbea0RJ6QK19OLU=' 
  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