SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8627d7bbfdce1299fc90181f5cb9c7dbcde97ede74bf7fb71c74efbc08a213' 
  AND token = 'YkkghED0wa69kaY+X6NkZdj4L0gXThoWEiZix55VW/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

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