SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee8cbb4817f8b8a4505fbf4d2ee1c0733df9d9976fbd735bc30cd388f01c05d' 
  AND token = 'k+J1qXwTnzG7X/HjDnvH0mVG4BZGc2GbbiLLsmZa41U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}