SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386474ca8f38e45b3463bd17878a880927dbe507b5b9b7cfc93989f871867806' 
  AND token = 'IMErTp+wOhnPlHZ8+mqU3/xcBbhz10mdZS3Z5m13MoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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