SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f0707f7542ef40b2db1c9a45e8ee6ec87876b605d00fd94c8687cd39e1d6e0' 
  AND token = 'txaRablYyZDIOoML6tpSiSJvly3ouoNGpBjUUj50+MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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