SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b96374bd26fb780e31200ac9225ae645c2bbd62bc2b331b8cca8cc8dad7992' 
  AND token = '/7OD29H7LmDrhF0mZJE2WPJSwpfQ/eay9UQz0A+WJ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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