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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64431e7d60a9ddc9495a6d98518ce8ba696f5fd00eb05e57639f897b11fbd695' 
  AND token = 'ZGFwTu8En5YynifTWvMRa241WOFcvDCdmVCwnh92wtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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