SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f0092858282c1467775fa7521ac3e9d6f15c2d50fbad58c8191b1e7aa2593c' 
  AND token = 'Fa/tduZBGQ0J3Aiu7kSjcQvzuP6hbQfmfHiDfZEjzZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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