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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6be7112d7c075c23f779b130cb60e22dad14f98d89811a1503fc6fd8e4bdb1b' 
  AND token = 'PhoP2LvKLlqDTZ1INYpUic5dYVH2c78463DZvy3re08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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