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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573fc15b350b9dce11ce778927c5c7778a3826d30c7136e537347a5d04e7215b' 
  AND token = 'tTEBODW5dgPjJw7KPLxiAxsE3jK9Np1174GpMA1iXKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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