SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1c1be8a7695aba7c5fe2c819dee235933f1d3a9491fa98cedd6250b08d6b88' 
  AND token = 'cRbACjeeT+vRXxC1yiZl8rfAe2j+aZC0RIcVQPZBzL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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