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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5984cc0f73686f30a0d7a28f667befe09ec77c6e67bd7bb60c9f98c13ea87e' 
  AND token = 'lQTkjfK8PkRvD2dy2e3lrRjLxmwaPgVc1Cq0SNwmX7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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