SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4f4c4dc1f38c7d232c5aaaa92ec18aab3d9bd40f5f70893e8868f9eb942770' 
  AND token = 'NuLfU9sQF/x+5CoBmwgQFR2uIq6B4QHqwXWi8f53sLA=' 
  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