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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd54af78a5493069babae76bf211b775963d0b65a8c9f36ab5a32be491e8b6a1' 
  AND token = 'qSjlc9vBELfrT45KPAdRq11w0lCn56jpOOLVLOdT9pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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