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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734a5a6c8134f232445f7a303af1f396d8f940cda96447ad459fa8b0fcd3e882' 
  AND token = '8Rf49V9zw2iUXSu2BIN5Nuax5s6gPMrjWqqaRHYlyRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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