SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acd4e5331848cdb870025d36ed9f14e87c508d677925c9e0b1eb3c9811c1750' 
  AND token = 'wgF23JWyenz4Kd/uxTzNjg6Eil/lj0DZdqEFVl3fyT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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