SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa26bffdff3e2651474d3e6c9f6c9fedb831cc32563845b482e16fa1061d487f' 
  AND token = 'WPjfbVvB+e9P/r0jqI6PgHi0578ysI73Y+/wW2oKCdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

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