SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63631dc1e8f59ba56e06f79c2f00f53bb92246ffdfec0edf8368fd1ff80acf92' 
  AND token = '4H7/fqa1fpYAZW2zND1l2ndYUJSFxi+YYq/VqzgLKBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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