SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80bffce19e5ecc924360e86347961f151673c45607b11e4ad74c8cabc2c2aab' 
  AND token = 'Lfm19+JyrtmXihnUEpBB9ZlNfCy0lGhuumj609Xb2BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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