SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35f01b91a84eaf201b71e109f25049e42b2d228c54adaa638896a4e16e47e3d' 
  AND token = 'DopDqUKX50nl+LYnen1UA/M5h7dd1rDMbMaI9DruFyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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