SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97981336412a6bd0a4a9f2a371e1f0f65ba23be375a8daf4659ff8b25f096f87' 
  AND token = 'JK45m/AqwMob/LfngphPztsxVPBJv4w3fD7BtwlZf5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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