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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cbb00c6cfee8c6a0263c0f20ed8d24b0f0451496554d891644bdfc822746146' 
  AND token = '+6LirB/EgvuzccEy5w5sNHMWCbf9nhv3YK/GFOVweFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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