SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b17f2ae6491180dbe570be6c6bea3a9f8daf77d828c59247dada75a705644e' 
  AND token = 'aU0535NAi+6RT9QO4TygMSYSY0EGI8zrTG4lKJ8UOSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

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