SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadd317dce9a7d37a12b7fa453d3c71b539f0bee3bdd2cf1ec09d64eb940f19f' 
  AND token = '5npD5q4u5DJ1/s4rKSzZiTYLVQUDpr3lGtPCOzYvIMo=' 
  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