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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fb12eecdc7f748ef96716adf5679ae0dceb36d58700f93308f6d001c8a60ab' 
  AND token = 'MRbWhVhbdmGcLpNuAMvmrnoBTCTl1XhynEN3hmqaozw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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