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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134edc06a71e25828cc66ea082be81bc2b16c4ad89ccf73b642e40e9e217656a' 
  AND token = 'z2UxYZhmxjj8sX4+gaa8eqboYcH4SR538X5fxzXficg=' 
  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