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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cfde1c6ade2d8e502ba7777f50967409b7f3aabcb05eea8bd57c6a27a2f45c' 
  AND token = 'KXf4a2IRUGNg8wAjlOaNVZJK9lUedu4IeR7Fw7m5cZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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