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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4202494856d70104cca3cacadefc814e03559d426aef5496bb7b8b06a2b19957' 
  AND token = 'UqmyXfe9ZXr8eJ2hRooLqCIUQBaNrBZ+DzrzOyQoAo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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