SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c6d3ea12d6bcb1d1da9f67e7bac4af66b11ca3fb3068f04fdd9b67d1340773' 
  AND token = 'Abx6n8CtXXqlHIzTQK+YMFhKuxMjKODSm50xhfM0CRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

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