SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725b1f155bc433dba9a85bef209bb97250093eafdcfeedb55bcac9212e907820' 
  AND token = 'r3A7wjEqqPhe/xwIfPCQtOi/oUk+H38BzvGYegpX2KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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