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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c59f7020e2acdf4653d6e56b6bcd8342f40ba53255a2eac0b8af0f00328fcd6' 
  AND token = 'dMeMSnU0gymi1qm8u7k4rnslfuTAoUZxwhKRK0DWMMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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