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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7361441de8df92e8e1d5aabb193a55f2e33fc50b49665617fac2b99d2dcfa2' 
  AND token = 'QkMSDq8MPu54Sb/XYgbxLe2yiTnzj0LAszI284YW70U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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