SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e449a76ba6cf1c00a72049504e32d5fc96336a70257c58bd6abc7c0fd3b3f8' 
  AND token = '1NfRK4pNlBW84rzk4H0qlMGkR/9C5qeFFasFuionTBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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