SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0244daff057660ec08f234ef1527b80a2704cadb6b944e2eb2badc90845968' 
  AND token = 'wx/SPi/4u+JNLUm2hWx4y8o7FS5/NiIcd14GkvbUkOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

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