SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daa0bab15fe37ffab25063ee326f0d04d2ebff0526c3ab77c2ac7007272c219' 
  AND token = 'N+qTEqwq2Bk0Ty1HBgWXMKsHqCtRaQsr8c0BzC4kTiY=' 
  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