SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205d77a81b1a0f99644817db697c2495e6cb07f96966a765bb1d52b5620e5db5' 
  AND token = 'i1GHAQqPD6GVbB7F5OyBGER0iS07et171VJl0d2Qr+E=' 
  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