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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695f955e225f5c9eed42d96a8ff8a3acde2fb745ea4061dddd259fb27c03f60b' 
  AND token = 'eo23E2XwV8PfzCTI7eVLr6GtAO63bYhFySw999qFhWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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