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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56458e7cb09bf8ff03f6ea078c324432f25316e74915f62829b5f75f9e87a41d' 
  AND token = 'GvOPQk1cUjGHdMKkdtoYZpkVUtQVMXuNUPMcmxL3FTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

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