SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245e42b6fd5ddc85ec19196b18a4d812b9670ef511bd81e5b78bbd7b01f71df6' 
  AND token = 'drxIbPWUQal7tYuUSUXRg5J2RsU+EDBOsKQMX+iyx2A=' 
  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