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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383c31e9eca19b730d2c5c7d001a93478ceb1e8eef5eb5ca674f4b19f3572a12' 
  AND token = 'AR6ebAYmGZq+XoiIpGeU002c467D1vo469QrjuNUOeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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