SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5150f5e9327880b7dcdefc1221e2e1d97a12ecf8c7a485593549447091247bdb' 
  AND token = 'NHOuvXatFuGZxi6oX/N58m84n0pExpOwDyR9HNKGYsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

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