SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9020b961696fddd68de6c7a65755adcc934f246b8b959d11c6d4a0b27c9396c6' 
  AND token = '3mXic9WoOmaDbYFATu6YhQjRnUgqg/WuASZHNIYrI9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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