SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12026ccd8555f274028620f87f35f231233a248daced621e1159a3ab55f2d1a5' 
  AND token = 'jIHIo6Xt5JQpho09+SzqU+uuEkdH87PT0hDUcNrmMpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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