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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5527c75dd4a88da0f2734f298b177d2dc6204df72c5e2327b85ea82c9d501c' 
  AND token = 'GGlynQZqEYwjc7iwAmMlUVvNQUcHAJcEDzJNvK4sCo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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