SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f36603e95c5f4edeb59b5fe539cc0362ac2cf8a9fe5a7f16447f6dafbbc11c7' 
  AND token = '7KpdKWMaxnrloc22qblO7VHyzJ6jmDnS6BTt/XLoA38=' 
  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