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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2fd3112f5f51f8fddb60fd14da5a91738e9687f06d5c84d92a1e2eaa31a237' 
  AND token = 'zEs5TBXfAfueCTWM57RUsHX5Kp8pbG8BQ9ttLcko9m4=' 
  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