SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1af3b16b4fb317c39a2ed8fd9603d496ba838565ae8530cf1782fc94d09640' 
  AND token = '9yDKwLKUf4QG62nhjrsBod+lvgbsVGpddDVWHvSBPck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

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