SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47afad3b34ff7df879999a3a5ddff9f695d95bbad64309d58a22d259d74842ca' 
  AND token = 'rONC25X62k1JbDVLSyFJ/XA9qR7km9l6utJe/vGDVcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

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