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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9e615b916e6bdad9b532f6f5ff0ca56a2c7114936f5a015bd16ae4706e7357' 
  AND token = 'fzZ9Ey/N+HVIHArO9xbZY+cdWwk0BHttq8SDn+UGgwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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