SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11548dbd8a7e4e9700be433f1e9add85cc8dcbed48d7e89f180179a47dff6708' 
  AND token = 'fNBMgOMNJt08uv0OOUASSVRVk2imgsqy/nBomf5cfOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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