SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65112d8c8b069cfe39d101a2cabb90a079f6864bc50baa5b1f159638596e95b' 
  AND token = 'qosheu5gXU1zscEEBcRlQmJtsOnDnzDayaqIgf+0KuY=' 
  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