SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8145fc8971f7fd382ee5a8c306384ece4bee437210afa5d6600e6e9f9daa51' 
  AND token = 'GO0veKMmfbPD3Dxsf1rrhqb+fkZ25FZU4cfnwOMASho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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