SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146916934a8f1e77a24cc1398d2259d730ed4fe2e9b8aaff95113fcb41944272' 
  AND token = 'RZDq+/x5S8KzbuYmCEMo7pqm9RZMzabguN/skF6ewro=' 
  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