SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3a3ca8c7fa42bcdaaf66edb507e4068250e200dfe2fccc943bb09968ee430c' 
  AND token = '+59F/q/GyB+EUbF9WilGZqOyngvtqOqFFX56ljtj38E=' 
  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