SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe233adbdfa1b4dd73960d8579fa6c4391119d439689ec2b9733cd4eb523e02' 
  AND token = 'cfWc2dxiO0EIgqkH53TQ1/+3Oc08eJz1hdN7yS/u55k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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