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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435de33498f496894bd509c23282b07108648d61e14f86bc6c27cb2d677b94c0' 
  AND token = 'c+hMpzh4eSv0LymziET1GyuovGgoeJeWobWn5+/SfvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

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