SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c825b762e2e2d1cd28a15559bf4a20273c3a0ab0f488f1c82fdd810bea331f0' 
  AND token = 'Bmf6VKBlN+qwj8clfqCjJgS8j+xC5nXKeEi12YVpP2I=' 
  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