SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0604411d26694b6e88ee7d0c2ee3c6794b38fd9fe1fe470f0e4016cb59f52692' 
  AND token = 'Ym0k07uzFgxF6nlVsduCn3UsRR2bRvTJjaWp/d6o8mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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