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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf60439b1575c7269a1c973268ce1c2a7ac2d45d286692fe67f3b762ef7db36' 
  AND token = 'jxQyED9Rb64imIvUIgVRANVKVHVhLojCRT64v7M5VXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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