SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925136d39c0e124fd186fceecfa3fc5af151f46fa950ec587e670f57113a2416' 
  AND token = 'c0fgcfUZ3YiR1fGl5EOLlyMKi/onKkL4LUhKEUWKhJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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