SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03978ad03867735c92101787a25a04ba5737fe6a23b48f6fff2559affb5f9ef' 
  AND token = 'vr5sZn3jmZUdue9dAhY+trDdGy+V2KknO/MKJrDVUOY=' 
  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