SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2348df9fff9c7bf173a36ba785b776bbe350e08bfa6b5987344a2306e5c9b5e8' 
  AND token = 'EQNmtrhNckj4RGiEgRSDg4wiO/Duu7NBGIn7SrZHhkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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