SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4572794fe9bf414f0276679d24ac19b2bc9d8edaa20908d4edfef8f17f6a5f58' 
  AND token = 'rxpHCD3AZNRw5ci6kmuRjtXlivB146HE4mleA0ZiPGI=' 
  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