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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63ca1099db2fbc2ea9d14ef81ca06d3d9b0f2fdb6c5513952ac1bb14f4b3c79' 
  AND token = 'jd/ZM7BDapL3h6t3wT5aPzINK6/69wgCLHnFvyGFRfM=' 
  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