SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aface61ac977186b43fe5fb0989a0d40ae46ba191e5b034700ac5a95e75a9e1' 
  AND token = '0JQUo1YevPRUfg+mbvGBW20TuYopUwKGgokYg9D33V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

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