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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3533ff4b19ab9c32f1b92f641555b527bff848199dd301cfb0b5f57084ecd91e' 
  AND token = '09lXh1rLBiJ7jolslwO9FPt7sgxc2Uwh2O/3MgETNFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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