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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47048e724f2b409f67e09ccde1eb0ac72cda6c286ae43137f983cca42a34b257' 
  AND token = 'dD6sUzFuaIarKWQvo87iyuQpYGvjXacz/UWlwxwI630=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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